@ARTICLE{DePierro1995,
  author={De Pierro, Alavaro},
  journal={IEEE Transactions on Medical Imaging}, 
  title={A modified expectation maximization algorithm for penalized likelihood estimation in emission tomography}, 
  year={1995},
  volume={14},
  number={1},
  pages={132-137},
  doi={10.1109/42.370409}}


@ARTICLE{Schramm2023,
  author={Schramm, Georg and Thielemans, Kris},
  journal={Frontiers in Nuclear Medicine}, 
  title={PARALLELPROJ—an open-source framework for fast calculation of projections in tomography}, 
  year={2023},
  volume={3},
  doi={10.3389/fnume.2023.1324562}}

@article{Lange1984,
	title = {{EM} reconstruction algorithms for emission and transmission tomography},
	volume = {8},
	issn = {03638715},
	number = {2},
	journal = {Journal of Computer Assisted Tomography},
	author = {Lange, Kenneth and Carson, Richard},
	year = {1984},
	pages = {306--316},
}
@article{Dempster1977,
	title = {{Maximum Likelihood from Incomplete Data via the EM Algorithm}},
	volume = {39},
	journal = {Journal of the Royal Statistical Society. Series B (Methodological)},
	author = {Dempster, P. and Laird, N. and Rubin, D.},
	year = {1977},
	pages = {1--38},
}

@article{Hudson1994,
	title = {Accelerated {Image} {Reconstructiong} using {Ordered} {Subsets} of {Projection} {Data}},
	volume = {13},
	doi = {10.1109/42.363108},
	number = {4},
	journal = {IEEE transactions on medical imaging},
	author = {Hudson, H. M. and Larkin, R. S.},
	year = {1994},
	pages = {601--609},
}

@article{Shepp1982,
	title = {Maximum {Likelihood} {Reconstruction} for {Emission} {Tomography}},
	volume = {1},
	doi = {10.1109/TMI.1982.4307558},
	number = {2},
	journal = {IEEE Transactions on Medical Imaging},
	author = {Shepp, L. A. and Vardi, Y.},
	year = {1982},
	pages = {113--122},
}

@article{Joseph1982,
	title = {An {Improved} {Algorithm} for {Reprojecting} {Rays} {Through} {Pixel} {Images}},
	volume = {1},
	doi = {10.1109/TMI.1982.4307572},
	number = {3},
	journal = {IEEE Transactions on Medical Imaging},
	author = {Joseph, Peter},
	year = {1982},
	pages = {192--196},
}

@article{Ehrhardt2019,
	title = {Faster {PET} reconstruction with non-smooth priors by randomization and preconditioning},
	volume = {64},
	doi = {10.1088/1361-6560/ab3d07},
	number = {22},
	journal = {Physics in Medicine and Biology},
	author = {Ehrhardt, Matthias J. and Markiewicz, Pawel and Schönlieb, Carola Bibiane},
	year = {2019},
}

@article{Schramm2022,
	title = {Fast and memory-efficient reconstruction of sparse {Poisson} data in listmode with non-smooth priors with application to time-of-flight {PET}},
	volume = {67},
	doi = {10.1088/1361-6560/ac71f1},
	number = {15},
	journal = {Physics in Medicine \& Biology},
	author = {Schramm, Georg and Holler, Martin},
	year = {2022},
	pages = {155020},
}
